While discussing her new children's book, River Rose and the Magical Lullaby, the "Piece by Piece" singer, 34, explained that she decided to write the story after penning a bedtime song for her firstborn.

"But when I sing to her now — she's heard it forever now 'cause she's 2 — she literally will put her hand, like, this close to my face, and she'll be like, 'Sing, sing, sing!" Clarkson explained, putting her hand up against her own face.

"I have to sing, like, these three songs every night," she continued. "And she'll put her hand in my [face], and she'll be like, 'Bye!' ... And then she's like, 'Bed!' and I'm like, 'OK, I guess you're done.' ... She's a diva! ... I'm pretty sure it's something to do with genetics."

Earlier in the day, Clarkson sat down for an interview with Ellen DeGeneres and revealed that she doesn't want any more kids. "We have four because I married into two," she explained of her relationship with husband Brandon Blackstock, who is dad of Savannah and Seth from a previous marriage. "I already have days where I, like, cry, so we don't need any more kids. It's a lot."